Scale-balancing device



H. B. BAGG.

SCALE BALANCING DEVICE.

APPLICATION FILED AuGJ. 1918.

Patented Apr. 4, 1922.

UNITED-STATES PATENT oF-Flcs.

HOLLIS B. BAGG, OF WATERTOWN, CONNECTICUT, ASSIGNOR TO SCOVILL MANUFAC- TUBING COMPANY, A CORPORATION OF CONNECTICUT.

SCALE-BALANCING DEVICE.`

Specification of Letters Patent.

Patented Apr. 4.-, 1922.

To all whom t may concern: f

Be it known that I, HOLLIS B. Brise, a citizenl of the United States, residing at Watertown, county of Litchfield, and State of Connecticut, have invented certain new and useful Improvements in Scale-Balancing Devices, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates tov improvements in scale balancing devices.

As is of course wellknown, before weights can be properly determined in 'a scale, the beam of the scale must be in equilibrium, that is, the scale must be what lis technically known as in balance. The balancing of a single beam scale is ordinarily accomplished by adding or deducting small weigh'ts,'such as shot, to or from the counterpoise, the counterpoise being chambered out to receive the shot. Such scales are usually provided with a controlling loop and lug which determine the movement of the beam in either direction and whether or not the scale is in balance is determined by observing the position of some moving part of the scale with respect to some stationary part, as, for instance, the position of the lug in the loop. Obviously, a balance determination obtained in this way is rough, depends to a very great extent on the judgment of the individual making the balance, and is unsuitable for fine work where the balance determination needs to be very accurate.

The present invention has for its object to produce a construction for balancing a single beam scale which is simple, inexpen# sive to construct, may be readily attached to well known forms of scale now in use and which enables a ne determination of balance to be readily, accurately and quickly made. v

With this and other objects not specificallyreferred to in view, the invention con sists in certain constructions, and in certain parts, improvements and combinations, as will be hereinafter fully described and then specifically pointed out.

In the accompanying drawings,

Figure 1 illustrates in side elevation, soy

much of an ordinary uneven single beam scoop scale as 1s necessary for an understanding of the invention, one form of the improved balance determining mechanism being shown in connection therewith.

F ig. 2 is a plan view on the line 2-2 of the construction shown in Fig. 1.

F ig. 3 is a side elevation or' the graduated part of the beam, and

F ig. 4 illustrates a modified construction of the balance determining means. i

In the drawing the scoop ,of the scale is indicated at 1, the scoop resting in theusual 'arms 2 carried on the connecting Vrod 3 which moves: through the standard 4. The standard 4 carries an arm 5 which is provided with uprights 6 having the usual bearings 7, these bearings receiving the usual knife edge bearings 8 carried on the butt 9 of the beam, the bearings which have just been described being usually termed the fulcrum bearings.y The butt of the beam is provided with the usual knife edge bearings 10 which restin circular bearings 11, these bearings being carried on the standard of the scale all as is usual'in constructions of this character. The graduated portion of the beam is indicated at 12, the poise cooperating therewith at 13 and the yusual counterpoise at 141. The lug and loop employed for determining the movement of the beam are also illustrated, the lug being marked 15 and the loop 16. All these parts are of usual construction.

In carrying the invention into effect, a pair of registering elements is'employed. While these elements may be variously constructed and arranged, in theparticular con* struction illustrated, oneof these elements is shown as a finger 17 which is mounted on and kprojects from the butt of the beam. The cooperating registering element is shown as a finger 18 extending from the scale standard, this element beingvbent upwardly. These parts when employed are so arranged that when the scale is in balance the ends of these fingers lie directly opposite each other. making fine determinations, the registering able a very accurate balance to be obtained. In the particular construction illustrated this is .accomplished by forming one of the elements with a pointed end and the other with a blade surface, the finger 17 being It is apparent that in" elements should be so constructed as to enshoivn as having the pointed end lf) and the finger 18 being shown as having a blade surface 20.

lt may be remarked that in scales ot the character illustrated, there is some tendency of the beam in Weighing to seing in a horizontal plane. By forming one ol the registering elements with blade surtace, the corresponding pointed end ot thc. other will be opposite some. part of the blade surface when the scale is in balance, notivithstand ing the horizontal movement of the parts referred to.

The means Jfor effecting the balance of the scale may be variously arranged. In the construction shown in Fig. l, the graduated portion of the beam carries a pair ot snpports 2l in which is carried a threaded rod 22. lhen this construction is employed, care should be taken that. the threaded rod is located accurately' along thc gravity line of the beam. This threaded red supports a Weight 23 which can be moved toward and away from the iulcrnm bearing et the beam to effect the balance. n

In the construction shown in Fig. 4l, the finger 17 is threaded and the Weight is mounted thereon. This latter construction presents certain advantages in the way of cheapness.

Changes and variations may be made in the constructions herein shown and described 'for carrying the invention into elf- -tect. The invention is not therefore to be confined to the particular constructions shown and described.

That is claimed is:

l. The combination, in a single beam scale, of a registering element extending Yfrom the butt ot the scale beam, a weight carried on said element and adjustable along it 'for balancing the scale. and a cooperative registering element.

Q. The combination, in a single beam scale, ol a registering finger having a pointed end extending from the butt ot' the scale beam, a balancing Weight adjustable along said finger for balancing the scale, and a cooperating blade element stationary with respect to the finger.

3. The combination, in a single beam scale, of a registering element comprising a {inger extending from the butt o'l the scale beam, a Weight mounted on said element and adjustable along it t'or balancing the scale, and a cooperating registering element sta.- tionary with respect thereto, one of said elements having a pointed end, and the other presenting a cooperating blade surface.

4r. The combination, in a single beam scale, ot' a counter-poise hanging from one end of the scale beam for adjustment by relatively large increments, a registering element extending from the other end ot' the beam, a balancing Weight adjustable along said element tor adjustment by relatively small increments, and a cooperatn'ig registering element stationary with respect to the first named registering element.

In testimony whereof, I have hereunto set my hand.

HOLLIS B. BAGG. 

